Bobbin-turning apparatus.



PATBNTED MAY 21,'19o7. R. M. eoommw.

BOBBIN TURNING APPARATUS.

APPLICATION nL'm) MAR.13.1 907.

2 snnms snnm 1.

ROBERT M. GOODNOW, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPERCOMPANY, OF HOPEDALE,

OF MAINE.

MASSACHUSETTS, A CORPORATION BOBBlN-TURNING APPARATUS.

Specification of Letters Patent.

Patented May 21, 1907.

Application filed March 13,1907. Serial No. 362,109.

To all whom it may concern:

Be it known that 1, ROBERT M. GoonNow, a citizen of the United States,and a resident of Hopedale, county of l/Vorcester, State ofMassachusetts, have invented an Improvement in Bobbin Turning Apparatus,of which the following description, in connection with the accompanyingdrawing, is a specification, like letters on the drawing representinglike parts.

This invention relates to apparatus for turning wooden articles, suchfor instance as bobbins for use in loom-shuttles, the apparatus ingeneral comprehending a revolving cutting tool, a table movable towardand from the tool, and means on the table for holding and rotating thework as it is pre sented to the cutting tool.

Broadly speaking such apparatus is not new, and some of the structuralfeatures of the apparatus in which I have embodied my present inventionare substantially such as are found in United States Patent No. 690,253,granted December 31, 1901 to G. A. Ensign. In such apparatus theoperator places the Work, such as a wooden blank, into position betweenthe head and tail stocks mounted on the table, and at such time there isdanger to the hands of the operator owing to the close proximity of thecutting tool, which revolves at a high rate of speed.

My present invention has for its object the production of means foreflectually shielding or guarding the cutting tool when not actuallyengaging the work, means being provided to retract the shieldautomatically and expose the cutting tool by or through movement of thetable to present the work to the tool, the withdrawal of the work fromthe tool effecting return of the shield to operative position withrelation to the cutting tool.

The various novel features of my invention will be fully described inthe subjoined specification and particularly pointed out in thefollowing claims.

Figure 1 is a front elevation of a bobbinturning apparatus embodying oneform of my invention, the shield being shown in retracted position toexpose the cutting tool; Fig. 2 is a right hand side elevation of theapparatus shown in Fig. 1, the hood for the tool being broken out toshow a portion of the cutting tool; Fig. 3 is a similar view of the hoodand shield but showing the latter in position to guard or cover thecutting tool:

The main frame A has two rotatable shafts B and C, separately driven bypulleys B, C from suitable belts, not shown, a cutting tool or head as Bbeing mounted on the shaft B and having suitable cutters B of thedesired form to shape the article to be turned.

Tracks or guideways D extending forward from frame A at right angles tothe revolving cutter-shaft B support a slide D and a truck-wheel Dattached to a table E which is movable toward and from the cutting tool.Said table has mounted upon it usual head and tail stock centers E, Erespectively, to receive between them and rotate the work, thehead-stock center E being driven from an auxiliary shaft C by a sprocketchain C intermeshing gears C and O on the shafts O and C effectingrotation of the latter.

The tail-stock center E ismounted in a tail-stock E adjustable on thesliding table E, the tail-stock center being controlled by a lever bywhich the said center can be retracted to discharge the finishedarticle.

When the work, such as a blank, is brought into engagement with thecenters, the table E is slid forward simultaneously, into the positionshown in Fig. 3, the work at that time occupying substantially theposition shown by the dotted circle 7 in Fig. 3, and

after the work is centered, the table is moved rearwardly to carry theblank against the cutting tool to be turned thereby into proper shape.

The table may be moved by hand, or it may be moved automatically, thelatter construction being shown herein.

The pulley C is loosely mounted on a sleeve F provided with a pinion F,the sleeve being loosely mounted on the shaft C, and a clutch F isarranged to connect the pulley C with the sleeve F.

An auxiliary shaft Or, see dotted lines Fig. 1, is provided with a cam Gand a gear Gr which meshes with a pinion G fast on the driving shaft O.i

A sleeve G on the auxiliary shaft G carries a gear G in mesh with thepinion F hereinbefore referred to, the sleeve having an attached pinionG meshing with a gear F fast on the driving shaft C.

The pinions F G and gears F, G, constitute speedreducing mechanism toreduce to the desired amount the speed of the shaft G below that of thedriving pulley C, the pinion G" and gear G acting to reduce the speed ofthe cam-shaft G-with relation to the main-shaft C.

A rock-shaft H mounted in bearings on the front of the stand A has anattached rocker-arm H connected by a link H with the table E, and afollower arm fast on the rock-shaft co-operates with the cam G and isheld in contact with the latter by a suitable spring H.

The cam G is so shaped that at one com plete revolution it will operatethrough the rock shaft H to slide the table E gradually toward thecutting tool, to permit the latter to act upon and properly turn theblank, and thereafter to slide the table back to starting position. I

The clutch F normally acts to operatively connect the pulley C andsleeve F, and said clutch is thrown out of operation to disengage thesaid pulley and sleeve by any suitable mechanism.

The table E is provided with a depending bearing L in which is slidablymounted a rod L, enlarged at its front end at L and a weighted latchlever L is pivoted in the said bearing L and normally rests on the rod,so that as the table slides outward said latch lever will catch againstthe head L Said rod is connected to a bell crank L pivoted at the rearof the main frame, and the bellcrank in turn is connected by a link Lwith a second bell-crank L see dotted lines Fig. 1. The latter by means\of link L and lever L is operatively connected with the clutch to movethe latter into inoperative position.

When the operator positions the blank be tween the centers E, E thetable is in its forward position and the latch L in engagement with thehead L and rod L, and at such time the clutch F is inoperative. Theoperator then lifts the latch L and releases the rod L, and the clutchis moved into operative position connecting the pulley C and the sleeveF whereby the shaft 0 is set in motion. Through the connectionsdescribed the work is rotated at the proper speed, and at the same timethe cam G is slowly revolved, the latter operating through therock-shaft H and the described connections to feed the table Erearwardly, bringing the work into engagement with the cutting tool, andduring such movement the latch L drops onto the rod L, behind the head LAs the cam continues to revolve, the table is again moved forward, andas it nears its starting position, the latch L engages the head L andthrough the described connections rocks the lever L", throwing out theclutch F and disconnecting the pulley C from the sleeve F, the movementof the. table and the rotation of the centers E, E then ceasing.

So far as concerns the movement of the work after it has been placed inposition between the centers, there is no particular danger to theoperator, for as has been set forth the feeding movement of the work tothe cutting tool, and the retraction of the work, after it has beenturned, is automatic, but even when the table is in its outermost orforward position, there is no great dis tance between the cutting tooland the workholding centers, and when the operative is placing the workbetween the centers, he is sometimes liable through carelessness orotherwise to place his hands or fingers within the range of the cuttingtool, revolving at high speed. Herein I have shown the cutting tool asinclosed within a hood comprising a substantially semi-cylindrical lowerportion 1, most clearly shown in Fig. 3, bolted or otherwise secured tothe top of the main frame A, and having a hinged cover portion 2,provided with an outlet duct 3 for the chips and dust resulting from theturning operation.

The two parts of the hood are cut away at the ends and in front to leavean opening, as 4, through which the work passes when it is presented tothe cutting tool.

Upon the ends of the hood cover 2, I mount segmental guideways or tracks5 on which are slidably mounted carriers 6, each provided with asegmental slot 7, through which extend a pin or stud 8 projecting fromthe adjacent end of the hood cover 2. The carriers 6 are preferably madeas castings and have inturned ears 9, see Fig. 1, to which is fixedlysecured a curved shield or guard 10, partly broken out in Fig. 1 to showthe cutting tool, The carriers 6 have formed thereon bearings 11 throughwhich is extended a-rod 12 provided at its ends outside the bearingspreferably with rolls 13.

The shield 10 is of sufficient depth to cover the openings in the frontof the hood, when said shield is in its normal position, as shown inFig. 3, so that at such time the cutting tool is completely inclosed,the shield being interposed between the tool and the hands of theoperator, so that by no possibility can any injury be caused.

I have provided means to control the shield by or through the movementof the table, so that when the table is moved to present the work to thecutting tool, the shield is lifted, exposing the cutter, and permittingthe work to enter the opening in the hood, and as the table is returnedto its forward position, the shield returns to position to close thehood and guard the tool. To this end I have provided cam-like brackets14 and 15, the latter being attached to the top of the table at one sideof the hood, as by a bolt 15 Fig. 1.

The bracket 14 has at its bottom anextension 16, see Fig. 3, secured tothe back part of the table by a bolt 14 the differ- ICC the cam faces 17of the two brackets being arranged to co-operate with the rolls 13.

When the shield is in its closing position, the adjacent roll rests onthe top of the enlarged face 19 of the bracket 14 to limit downwardmovement of the shield.

The studs 8 prevent any tendency of the shield to lift or separate fromthe curved guide 5 on which the carriers 6 slide.

Supposing the parts to he in the position shown in Fig. 3, as the tableE is moved in the direction of the arrow 20, the inclined cam-faces 17act upon the rolls 13, and lift the shield from the position shown inFig. 3 to the position shown in Fig. 2, opening the hood and permittingthe work to enter. Further movement of the table in the direction ofarrow 20 causes the rolls 13 to travel upon the horizontal portions 18of the brackets which are dwell portions as it were, the shield beingthereby maintained in its lifted position while the table completes itsinward or feed movement. ing been properly acted upon by the cuttingtool, the table is moved outward, and as it moves, the rolls 13gradually travel down the inclined cam-faces 17 until the originalposition, shown in Fig. 3, is again resumed.

WVhenever it is desired to change the cutting tool, or to adjust oralter the blades thereof, the top portion 2 of the hood is swung backand carries with it the shield, as will he manifest, the pins or studs 8at such time preventing the carrier 6 to which the shield is attachedfrom dropping off the hood top.

When the top is swung back the shield resumes its operative position asshown in Fig. 3, without any further attention or care on the part ofthe operator.

I do not herein claim any of the specific details of construction of theturning apparatus, per 36, as the same are not of invention, but so faras I am aware it is new in apparatus of this type to provide a shieldfor the cutting tool, and to automatically move the shield into and outof operative position with relation to the cutting tool, as the work ismoved away from or toward such tool. My invention is therefore notrestricted to the precise construction and arrangement of the turningmechanism, and changes or modifications may be made inthe constructionand arrangement of the shield and the means for operating it withoutdeparting from the spirit and scope of my invention as set forth in theappended claims.

Having fully described my invention, what The work hav- I claim as newand desire to secure by Letters Patent is 1. In a turning lathe, arevolving cutting tool, a sliding table carrying head and tail stocksfor the work and movable toward and from the cutting tool, a shield forthe latterv and means governed by movement of the table to move theshield to expose the cutter as the work is brought into position to beacted upon by the cutting tool.

2. In a turning lathe, a revolving cutting tool, a shield therefor, atable movable to ward and from the tool and provided with work-holdingmeans, and means, operated by movement of the table to present the workto the cutting tool, to retract the shield, and to effect return of theshield to normal position as the table is moved to withdraw the work.

3. In a turning lathe, a revolving cutting tool, a shield movable tocover or uncover the tool, means to hold the Work and present it to thecutting tool, and controlling connections between said means and theshield, to cause the latter to uncover the tool when the work ispresented thereto and to cover the tool when the work is withdrawn.

1. In a turning lathe, a revolving cutting tool, a hood inclosing thesame and having a work-receiving opening, a shield to normally close theopening, a table movable toward and from the tool, work-holding devices011 the table, and means to retract the shield by movement of the tableto present the work to the cutting tool and to effect return of theshield to normal position when the table is moved to withdraw the workfrom the cutting tool.

5. In apparatus of the class described, a revolving cutting tool,work-holding means movable toward and from the tool, a shield for thelatter, and means to retract the shield and expose the tool when thework is presented to the tool.

6. In apparatus. of the class described, a revolving cutting tool, aninclosing hood having a WOIk-TQCQIVIH opening, a shield slidable on thehood to cIose said opening, a table movable toward and from the tool,workholding means on the table, and a cam device on the table toco-operate with the shield and lift the same to uncover the opening inthe hood when the table is moved toward. the tool.

7. In apparatus of the class described, a revolving cutting tool, aninclosing hood having a work-receiving opening, a shield to close theopening, shield-carriers slidably mounted on the hood and having rolls,a table movable toward and from the tool and provided with work-holdingmeans, and cam deviceson the table to engage the carrier rolls shieldwhen the Work is presented to the ac-' tion of the tool, the openingmovement of the top portion of the covercarrying the shield with it.

9. In apparatus of the class described, a

revolving cutting tool, work-holding means,

tool and means toward and away from each other, a shield for the tool,and means to retract the shield and expose the tool when the work andtool are brought together.

name to this specification, in the presence of two subscribingwitnesses.

ROBERT M. GOODNOW. Witnesses:

EUGENE BEAUDRY, CLARE HILL DRAPER.

devices to cause relative movement of said 15 In testimony whereof, Ihave signed my 20

